diff options
| author | Kevin O'Connor <kevin@koconnor.net> | 2019-07-23 23:51:31 -0400 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2019-07-25 18:08:28 -0400 |
| commit | d501ca6b0b8d58d666cfbee87731e409b55dd902 (patch) | |
| tree | 1ec67bf43d27fd64e7e8c801cb07961eadc6ee4a /src/stm32f4/gpio.c | |
| parent | 5a02572001d1d903bdb36c13396efe73f3835a67 (diff) | |
| download | kutter-d501ca6b0b8d58d666cfbee87731e409b55dd902.tar.gz kutter-d501ca6b0b8d58d666cfbee87731e409b55dd902.tar.xz kutter-d501ca6b0b8d58d666cfbee87731e409b55dd902.zip | |
stm32f4: Add initial support for STM32F446 chip
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Diffstat (limited to 'src/stm32f4/gpio.c')
| -rw-r--r-- | src/stm32f4/gpio.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/stm32f4/gpio.c b/src/stm32f4/gpio.c new file mode 100644 index 00000000..370aba1f --- /dev/null +++ b/src/stm32f4/gpio.c @@ -0,0 +1,27 @@ +// GPIO functions on stm32f4 +// +// Copyright (C) 2019 Kevin O'Connor <kevin@koconnor.net> +// +// This file may be distributed under the terms of the GNU GPLv3 license. + +#include "internal.h" // gpio_peripheral + +static GPIO_TypeDef * const digital_regs[] = { + GPIOA, GPIOB, GPIOC +}; + +// Set the mode and extended function of a pin +void +gpio_peripheral(uint32_t gpio, uint32_t mode, uint32_t func, int pullup) +{ + GPIO_TypeDef *regs = digital_regs[GPIO2PORT(gpio)]; + uint32_t pup = pullup ? (pullup > 0 ? 1 : 2) : 0; + uint32_t pos = gpio % 16, af_reg = pos / 8; + uint32_t af_shift = (pos % 8) * 4, af_msk = 0x0f << af_shift; + uint32_t m_shift = pos * 2, m_msk = 0x03 << m_shift; + + regs->AFR[af_reg] = (regs->AFR[af_reg] & ~af_msk) | (func << af_shift); + regs->MODER = (regs->MODER & ~m_msk) | (mode << m_shift); + regs->PUPDR = (regs->PUPDR & ~m_msk) | (pup << m_shift); + regs->OSPEEDR = (regs->OSPEEDR & ~m_msk) | (0x02 << m_shift); +} |